package com.wz.jiangsu.wangteng.flink;

import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.operators.AggregateOperator;
import org.apache.flink.api.java.operators.DataSource;
import org.apache.flink.api.java.operators.FlatMapOperator;
import org.apache.flink.api.java.operators.UnsortedGrouping;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;

public class TestFlink {
    public static void main(String[] args) throws Exception {
        ExecutionEnvironment evn = ExecutionEnvironment.getExecutionEnvironment();

        DataSource<String> inputWords = evn.readTextFile("input/words.txt");

        FlatMapOperator<String, Tuple2<String, Long>> returns = inputWords.flatMap((String line, Collector<Tuple2<String, Long>> out) -> {
                    String[] words = line.split(" ");

                    for (String word : words) {
                        out.collect(Tuple2.of(word, 1L));
                    }
                })
                .returns(Types.TUPLE(Types.STRING, Types.LONG));

        UnsortedGrouping<Tuple2<String, Long>> tuple2UnsortedGrouping = returns.groupBy(0);

        AggregateOperator<Tuple2<String, Long>> sum = tuple2UnsortedGrouping.sum(1);

        sum.print();


    }
}
